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When two solids are joined to form a combined solid, the total surface area of the new solid is found by: (CSA = curved surface area, TSA = total surface area)

Class 10Surface Area of Combined SolidsMensuration
  • Aadding the curved/visible surface areas exposed in the combined solid
  • Badding the total surface areas of both separate solids
  • Csubtracting the smaller TSA from the larger TSA
  • Dmultiplying the two surface areas

Step-by-Step Solution

The faces where the solids join are hidden, so we only add the surfaces that remain exposed (visible) in the combined solid.
Answer: A) adding the curved/visible surface areas exposed in the combined solid

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